@TimLymington, Pratchett would have had a character (Medium Dave Lilywhite, maybe?) call it "extra medium".
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JeffSaholApr 14 '14 at 18:17

4

from a usability perspective, you are doing it wrong if you need a label for every size. Labels are meaningless in such a respect, as are pixels (could you mentally visualize 96px if you werent one of the developers?) ask how you can improve your approach on ux.stackexchange
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n00bApr 14 '14 at 19:52

Why wouldn't it be nice to rename the rest? As one of the answers mentions, using a 'extra-large' label might be suitable.
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dwjohnstonApr 15 '14 at 4:59

+1 Smedium is a great word. I'm going to have to use that often enough to remember it. "No, actually, it's not small at all, I think you'll find it's closer to smedium, so there."
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FrankApr 14 '14 at 14:46

Or smish, halfway between smallish and mediumish.
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bibApr 14 '14 at 15:00

3

You might as well make up a gibberish word as use smedium.
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OldcatApr 14 '14 at 16:51

Not quite the same as CSS font-size 'smaller' but I think the meaning is clear, it's not medium and it's not small.

smallish if you prefer.

Learn the lesson not to call 'styles' by a common enumeration, small=size32, medium=size64, large=size96. Then you can add in as many different sizes as you want, you can easily slip in a size48 without worrying about any knock on effect to other styles.

I'm afraid smaller doesn't cut it, because there's no obvious way to indicate whether you mean smaller than medium or smaller than small. In which context I would just note that the "subtitle font size" selection control in VLC media player uses smaller and larger for the two extremes (beyond small and large).
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FumbleFingersApr 14 '14 at 14:57

I had it in my mind that the 'naming' was internal and only the developers would have to know that smaller came between medium and small, I guess if that was the case this question would be on SO rather than here.
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FrankApr 14 '14 at 15:10

I like this approach, although my recommendation would be to go in the other direction, so that the four button sizes are ultimately small, medium, large, and extra large. (Or, if the O.P. would prefer a single word, jumbo could be used instead of extra large.)
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J.R.Apr 14 '14 at 20:19

Several user interfaces use compact as another word for “small.” For example, Gmail and Google Docs offer compact controls as a slightly-tighter-than-medium setting. It’s also an established term for small cars.

I like the idea of creating an extra size on the large end of the spectrum rather than the small end of the spectrum because of the difference in sizes.

32 / 48 / 64 have a difference of 16 between them and 64 / 96 have a difference of 32.

"Jumbo" is also a fun word and seems to connote inordinately large.

I used to work at a concession stand that had only one size of drink. Only the drink price was listed. People would often ask what size it was. I would say, "We only have one size: double extra jumbo!" poking fun at the crazy names and sizes of portions in movie theaters.

I have done a lot of websites with inventory (mainly this applies to shirts) and have always combined. I am leaving this as my own answer because every other answer is combining the opposite as I have seen/used. To me it is always the smallest first.

Here are the default sizes I set in the back end for shirts for one company.
- xxx-small
- xx-small
- x-small
- small
- small/medium
- medium
- medium/large
- large
- x-large
- xx-large
- xxx-large
- xxxx-large
- xxxxx-large

Note that this is the available options I have for the store to choose from. I don't think they have ever chosen all for one shirt. For instance most women clothing goes from x-small to xx-large. Also they might not use any of the "in-between" sizes. You really shouldn't do this unless you are very very specific on what size your small and medium would be. The only differences between sites is that some use the dash - so "small-medium", some abbreviate - so "s/m", and some use numbers for the x's - so "4x-large". Never used a bigger size first nor a smedium. Might be a cool size for a drink but I am not sure a serious site would use it for clothing or something like that.